If you ever want Steampunk in the game it’s going to have to be thru mods - because it’s not going to happen officially. Don’t feel bad tho - you aren’t the first to think that just because you saw some random ass engine lying on the ground around the game that that meant GD was Steampunk, and you won’t be the last.
If you ponder on it tho and really look at the game and pay attention it will dawn on you that, besides the Victorian-era feel of the game, literally the only thing in the game that even remotely hints at Steampunk is those exceedingly few engines. I guess you could make an argument for the firearms but for the most part they don’t really look Steampunk - but it’s kinda hard to pin down that area of Steampunk as gun designs vary wildly - from almost normal looking to extremely fantastical…